LwRB latest-develop documentation

Welcome to the documentation for version latest-develop.

LwRB is a generic FIFO (First In; First Out) buffer library optimized for embedded systems.

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Features

  • Written in C (C11), compatible with size_t for size data types

  • Platform independent, no architecture specific code

  • FIFO (First In First Out) buffer implementation

  • No dynamic memory allocation, data is static array

  • Uses optimized memory copy instead of loops to read/write data from/to memory

  • Thread safe when used as pipe with single write and single read entries

  • Interrupt safe when used as pipe with single write and single read entries

  • Suitable for DMA transfers from and to memory with zero-copy overhead between buffer and application memory

  • Supports data peek, skip for read and advance for write

  • Implements support for event notifications

  • User friendly MIT license

Requirements

  • C compiler

  • Less than 1kB of non-volatile memory

Contribute

Fresh contributions are always welcome. Simple instructions to proceed:

  1. Fork Github repository

  2. Respect C style & coding rules used by the library

  3. Create a pull request to develop branch with new features or bug fixes

Alternatively you may:

  1. Report a bug

  2. Ask for a feature request

Example code

Minimalistic example code to read and write data to buffer

Example code
 1/* Declare rb instance & raw data */
 2lwrb_t buff;
 3uint8_t buff_data[8];
 4
 5/* Application variables */
 6uint8_t data[2];
 7size_t len;
 8
 9/* Application code ... */
10lwrb_init(&buff, buff_data, sizeof(buff_data)); /* Initialize buffer */
11
12/* Write 4 bytes of data */
13lwrb_write(&buff, "0123", 4);
14
15/* Try to read buffer */
16/* len holds number of bytes read */
17/* Read until len == 0, when buffer is empty */
18while ((len = lwrb_read(&buff, data, sizeof(data))) > 0) {
19    printf("Successfully read %d bytes\r\n", (int)len);
20}

License

MIT License

Copyright (c) 2024 Tilen MAJERLE

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.